Hi Jane
I found at the time of making a quick decision for surgery I went with what the the doctor recommended which was a mastectomy. There is so much information out there which was way over my head from a technical perspective, my doctor was my interpreter through the minefield of test results and best outcomes, that's her job and I put my trust in her advice.
I believe, and please someone correct me if I am wrong, that radiation always follows a lumpectomy, having had a mastectomy and good pathology results from the surgery it is looking unlikely radiation will be required, and as far as I am concerned the less treatment my body has to endure the better in the long term.
Having said that a mastectomy was a no-brainer for me, I am 50yo, have a close family and my husband is my best friend, if I were perhaps single or younger, or both it would have been more difficult decision to make.
I picked up my permanent external prosthesis last week and must say I am very happy with it. I will consider reconstruction down the track but that is for another day.
Good luck with your decision and trust in your medical professionals.
Love & luck
Carol